things iiot

medium access

wireless mesh

fog computing

wireless

mac protocol

wireless networks

industrial iot

network performance

LoRaWAN is one of the most promising standards for IoT applications.&#13;\nNevertheless, the high density of end-devices expected for each gateway, the&#13;\nabsence of an effective synchronization scheme between gateway and end-devices,&#13;\nchallenge the scalability of these networks. In this article, we propose to&#13;\nregulate the communication of LoRaWAN networks using a Slotted-ALOHA (S-ALOHA)&#13;\ninstead of the classic ALOHA approach used by LoRa. The implementation is an&#13;\noverlay on top of the standard LoRaWAN; thus no modification in pre-existing&#13;\nLoRaWAN firmware and libraries is necessary. Our method is based on a novel&#13;\ndistributed synchronization service that is suitable for low-cost IoT&#13;\nend-nodes. S-ALOHA supported by our synchronization service significantly&#13;\nimproves the performance of traditional LoRaWAN networks regarding packet loss&#13;\nrate and network throughput.

Slotted ALOHA Overlay on LoRaWAN - A Distributed Synchronization Approach